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    Academic Journal

    Source: Proceedings of the National Academy of Sciences of the United States of America, 1997 Nov . 94(24), 13028-13033.

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    Academic Journal

    Source: Philosophical Transactions: Biological Sciences, 2009 Aug 01. 364(1527), 2177-2185.

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    Academic Journal

    Source: Proceedings of the National Academy of Sciences of the United States of America, 1990 Jan 01. 87(2), 663-667.

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